after vim 8 installation, yanking (yy) doesn't work in global command and macros

After I installed the Vim 8 version, I noticed that the following command doesn't yank the current line for every line it's supposed to run on.

%g/^/normal yyp

When I run it, it pastes whatever was previously copied. When I run "normal yyp", this works fine, it just doesn't seem to work in global commands and in macros. Here is my example:

Example:
-----------
string currently stored in clipboard: 7777
command given: %g/^/normal yyp
original text:
1234
5678

new text (actual output):
1234
7777
5678
7777

new text (expected output):
1234
1234
5678
5678

This seems like a real bug as I never experienced this in earlier versions.

Bryce

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